Vihtavuori N550 Rifle Powder - 8lb Originally developed for .30-06 Springfield and .308 Winchester, Vihtavuori N550 is a powerhouse performer for shooters who demand both flexibility and performance. Ideal for 30-caliber magnums with lighter bullets, N550 also shines in heavy .30-06 loads, potent 6.5x55 SE setups, and a broad range of other applications. With a symmetrical tubular grain shape (1.0 mm x 1.0 mm), N550 flows smoothly through reloading equipment for easy, consistent metering. As part of the high-energy N500 series, it's enhanced with nitroglycerine for improved velocity and energy-while maintaining pressures comparable to N100 series powders. That means more speed without added stress on your rifle. Sitting at a medium burn rate, similar to N150, N550 gives you dependable performance across disciplines.